me-web? skeleton: Avalonia 12 app, server, packaging and CI

The first screen (online or not, a Check button, every language with a
draft notice), the desktop and Android heads, the server's /api/info and
/api/ip, a release tool that builds deb, rpm, a Windows exe, macOS zips,
a signed APK and the server, and the Gitea workflows that run it. Rules
adapted from passolo; AGPL-3.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

MeWeb.slnx

@@ -0,0 +1,9 @@
+<Solution>
+  <Folder Name="/src/">
+    <Project Path="src/MeWeb.Shared/MeWeb.Shared.csproj" />
+    <Project Path="src/MeWeb.App/MeWeb.App.csproj" />
+    <Project Path="src/MeWeb.Desktop/MeWeb.Desktop.csproj" />
+    <Project Path="src/MeWeb.Android/MeWeb.Android.csproj" />
+    <Project Path="src/MeWeb.Server/MeWeb.Server.csproj" />
+  </Folder>
+</Solution>